Comparison of Bacterial and Yeast Ethanol Fermentation Yield from Rice Straw
This study was to investigate the fermentation of rice straw using various microorganisms, i.e., the bacterium Zymomonas mobilis, a distillery yeast Saccharomyces cerevisiae and a co-culture of Zymomonas mobilis and Saccharomyces cerevisiae. Rice straw was pretreated with alkaline and followed by enzymatic hydrolysis using cellulase before fermentation by the bacterium and a distillery yeast. Results show that alkali pretreatment is appropriate for rice straw since this pretreatment condition can produce the maximum cellulose of 88.96% and reducing sugar content of 9.18 g/l. Furthermore, the ethanol yield after enzymatic hydrolysis (expressed as % theoretical yield) was 15.94-19.73% for the bacterium, 20.48-35.70% for yeast and 21.56-29.89% for co-culture. Therefore, the distillery yeast was a suitable microorganism for ethanol production from rice straw.
Weiguo Pan, Jianxing Ren and Yongguang Li
B. Laobussararak et al., "Comparison of Bacterial and Yeast Ethanol Fermentation Yield from Rice Straw", Advanced Materials Research, Vols. 347-353, pp. 2541-2544, 2012